ML19323B759
| ML19323B759 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 04/25/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Whitmer C GEORGIA POWER CO. |
| References | |
| TAC-13283, TAC-13284, NUDOCS 8005140201 | |
| Download: ML19323B759 (3) | |
Text
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UNITED STATES E
NUCLEAR REGULATORY COMMISSION o
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WASHINGTON. D. C. 20655
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APRIL 2 5 1980 Docket Nos. 50-321 and 50-366
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Mr. Charles F. Whitmer Vice President - Engineering Georgia Power Cogany P. O. Box 4545 Atlanta, Georgia 30302
Dear Mr. Whitmer:
SUBJECT:
EFFECT OF A DC POWER SUPPLY FAILURE ON ECCS PERFORMANCE It has generally been recognized that the loss of a direct current (DC) power supply could disable several emergency core cooling system cogonents and thereby could result in a limiting single failure condition for some breaks. The enclosed letter report was submitted to the NRC staff by the General Electric Company to provide a definitive, generic, reference analysis of the effects of DC power supply failurts on ECCS conformance calculations. The NRC staff is reviewing the analysis which compares the peak cladding temperatures associated with various postulated DC power supply failure (ECCS egipment availability) cases to the peak cladding temperatures for a HPCI (small break) failure and LPCI injection valve (large break) failure cases. Since the stu@ was based on plant design information which may have been incomplete or out-of-date, some uncer- -
tainty exists whether the worse ECCS system availability combinations have been identified for your operating BWRs. Accordingly, in order that we may have an adequate level of assurance that the systems com-binations assumed in the generic analysis are conservative for Hatch Units 1 and 2, we request that you confirm the conclusion of the reference stu@ regarding the mininum ECCS equipment availability with a DC power supply failure.
Include in your response a list of the ECCS equipment that would be available for large and small (1) recirculation loop discharge breaks, and (2) recirculation loop suction breaks. The listing of equipment available should take into account not only DC power supply failure, but also loss of equipment due to water spillage.
Please provide a schedule for your response within 30 days of the receipt of this letter.
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l 3 5 250 Mr. Charles Whitmer.
This request for generic information was approved by GA0 under clearance number B-180225(579018); this clearance expires October 31, 1980.,
Sincerely, f
The A. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
General Electric Company letter (R. E. Engel) to USNRC (P. S.
Check), "DC Power Source Failure for BWR/3 and 4," dated November 1, 1978.
cc w/ enclosure:
See next page e
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.o Mr. William Widner Georgia Power Cogany APRIL 25500 l
cc:
G. F. Trowbridge, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.
_ Washington, D. C.
20036 Ruble A. Thomas Vice President P. O. Box 2625 Southern Services, Inc.
Bimingham, Alabama 35202 Ozen Batum P. O. Box 2625 Southern Services, Inc.
Birmingham, Alabama 35202 Mr. L. T. Gucwa Georgia Power Company Engineering Department P. O. Box 4545 Atlanta, Georgia 30302 Appling County Public Library Parker Street Baxley, Georgia 31413 Mr. R. F. Rogers U. S. Nuclear Regulatory Commission P. O. Box 710 Baxley, Georgia 31513
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